CN115593125A - Method for matching colors of digital printing and flexography - Google Patents
Method for matching colors of digital printing and flexography Download PDFInfo
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- CN115593125A CN115593125A CN202211350442.XA CN202211350442A CN115593125A CN 115593125 A CN115593125 A CN 115593125A CN 202211350442 A CN202211350442 A CN 202211350442A CN 115593125 A CN115593125 A CN 115593125A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1203—Improving or facilitating administration, e.g. print management
- G06F3/1208—Improving or facilitating administration, e.g. print management resulting in improved quality of the output result, e.g. print layout, colours, workflows, print preview
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
The invention discloses a method for matching colors of digital printing and flexography, belonging to the technical field of printing color matching, which comprises the following steps; s1, performing daily maintenance and maintenance of a machine, particularly cleaning and maintaining parts which have large influence on printing quality; s2, automatically calibrating the color of the machine by using an online densitometer carried by the machine; s3, preparing early-stage preparation work; because the uncontrollable factors of the printing equipment are more, the printing equipment is adjusted to a standard state; the invention has the beneficial effects that: the color matching between the digital printing and the traditional printing is realized, the digital printing delta E advantage is combined with the traditional printing, the printing quality is better, and the brushing and flow efficiency is effectively improved; the printing and proofing colors can be matched quickly; not only depends on the personal experience of a printer, the automation degree is obviously improved, the printing efficiency is improved, the loss of paper and printing ink is greatly reduced, and the product competitiveness is improved.
Description
Technical Field
The invention relates to the technical field of printing color matching, in particular to a method for matching colors of digital printing and flexography.
Background
In recent years, digital printing technology and its related industries have rapidly developed globally. Digital printing equipment is widely applied, and the continuous development and progress of digital printing technology enable digital printing to be more and more accepted and accepted, the image printing quality of digital printing machines of certain models is very close to that of traditional offset printing, and the digital printing replaces the traditional offset printing in a plurality of subdivided printing markets, so that the requirements of people on individuation and diversification of printed matters are met; in China, printing digitization is one of the important factors driving the development of the printing industry; digital printing has now enjoyed a revolutionary age; compared with flexography, digital printing has incomparable advantages in the aspects of on-demand printing, variable data printing and the like; in fact, the core of digital printing is digital, and enterprises should effectively use the advantages of digital printing to realize the construction of brand new business networks and operation management modes by digital environment, digital resource integration, network transmission, prepress design and processing, after printing according to needs, logistics networks and channels, and business network points, thereby greatly improving the productivity and competitiveness of the enterprises; with the shortening of the printing flow, the reduction of the printing cost and the diversity of the printed matters, how to keep the quality unchanged on the basis of quantity change matches the control of the printed matters in the aspects of hue, lightness and saturation with the flexographic printing, namely how to make a digital printing device and a flexographic printing device, and the digital printing device and the flexographic printing device are consistent in the aspects of output quality, color and the like;
the problem that digital printing color management exists is because the color management function of digital printing machine self-bring actual use effect is unsatisfactory, and the color of digital printing can't accomplish and flexography phase-match, can not satisfy the requirement of printing enterprise to the colour.
Disclosure of Invention
The present invention has been made in view of the problems in the existing color matching method for digital printing and flexographic printing.
Therefore, the invention aims to provide a method for matching colors of digital printing and flexography, which solves the problems of color management of digital printing, such as unsatisfactory actual use effect of the color management function of a digital printing machine, incapability of matching colors of digital printing with flexography and incapability of meeting the color requirements of printing enterprises.
In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:
a method for matching colors of digital printing and flexography specifically comprises the following steps;
s1, performing daily maintenance and maintenance of a machine, particularly cleaning and maintaining parts which have large influence on printing quality;
s2, automatically calibrating the color of the machine by using an online densitometer carried by the machine;
s3, preparing early-stage preparation work; because the uncontrollable factors of the printing equipment are more, the printing equipment is adjusted to a standard state; the method specifically comprises the steps of S31 adjusting traditional printing equipment and printing conditions, S32 controlling printing solid density, S33 adjusting the ratio of a dot expansion curve, S34 controlling gray balance, S35 adjusting printing uniformity and S36 controlling printing speed;
s4, preparing digital printing; the method specifically comprises the steps of S41 printer linearization calibration, S42 recording a characterization curve, S43 color conversion and S44 color matching;
s5, detecting a printed product; the method specifically comprises S51 test evaluation sample, S52 data measurement and result comparison.
As a preferable aspect of the method for color matching between digital printing and flexographic printing according to the present invention, wherein: s31, adjusting the traditional printing equipment and the printing conditions: changing rubber cloth, selecting proper packing, adjusting the pressure between printing plates and the pH value of fountain solution, and controlling the temperature and the humidity of the environment; printing is started ready, using the color sequence black/cyan/magenta/yellow.
As a preferable aspect of the method for matching colors of digital printing and flexographic printing according to the present invention, wherein: in the whole printing process, printing is carried out according to the printing standard, the seal Zhang Yinping is printed, and the density values of solid primary colors are recorded when the color difference is minimum, so that the color control in the actual printing production is facilitated: and adjusting the proportion of the S33 dot gain curve: in the working flow before printing, the influence of the dot expansion on the printing is controlled by adjusting the expansion ratio of the dots and manufacturing an inverse compensation curve corresponding to the printing plate; in the plate making process, the traditional printing IS controlled according to the dot expansion curve provided in IS0 12647-2, and the intermediate dot expansion ratio IS about 16%.
As a preferable aspect of the method for color matching between digital printing and flexographic printing according to the present invention, wherein: s34, controlling ash balance: controlling the neutral ash part of the printed matter well to obtain a qualified printed matter; in the actual printing production, relevant color management software is adopted to make an equipment characteristic curve of the printing press, the equipment characteristic curve is put into a CTP flow to control the corresponding printing plate output, or a G7 calibration curve method is adopted to make a printing plate compensation curve to realize the neutral gray balance of a printed matter.
As a preferable aspect of the method for color matching between digital printing and flexographic printing according to the present invention, wherein: s35, adjusting printing uniformity: the press key is adjusted to reduce the variation of solid density on the printed sheet, the variation of each ink on the printing surface is not more than 0.05, so that the variation of gray balance is as small as possible, and the variation of gray balance is not more than 1.0a or 2.0b on the printing area or the rolling position.
As a preferable aspect of the method for color matching between digital printing and flexographic printing according to the present invention, wherein: the S36 print speed control: running the machine with a production speed of 1000 sheets or more, again checking the solid density, ash balance and uniformity; if the variation of the solid density, the ash balance or the uniformity of the printing ink exceeds a numerical value, adjusting the printing machine to ensure that the qualified printing requirement is obtained, then accelerating again according to the requirement, and printing at the normal production speed to ensure the uniformity and the relative stability of the quality of the printed matter; after the above steps are completed, the printing press has reached a relatively good condition, at which point the production of the press profile for conventional printing, printing IT8.7/3 or ECI2002, to produce the press output profile and comparison with the IS0 standard proof IS commenced.
As a preferable aspect of the method for color matching between digital printing and flexographic printing according to the present invention, wherein: the S41 printer linearization calibration: the digital printer is capable of generating foreseeable colors from a specific color input value and evaluating the color value;
said S42 records a characterization curve: establishing color characteristics of each device, wherein the color characteristics can be recorded by generating a 'feature file' through cooperation of third-party color management software and hardware; this step is used to create a profile for the digital printing apparatus.
As a preferable aspect of the method for matching colors of digital printing and flexographic printing according to the present invention, wherein: the S43 color conversion: firstly, converting a color mode from RGB into a Lab mode, and then converting the color mode into a CMYK mode; printing is the process of color reproduction and reproduction; each device has its own color gamut space, and performs color conversion of the color gamut space in the copying process; utilizing the ICC output curve of the printing machine made in the previous printing process as a target to carry out analog matching on the ICC output curve, and taking the obtained digital printing machine curve as a final output curve; s44, color matching: color matching is accomplished by third party color management software, which chooses GMG or CGS.
As a preferable aspect of the method for color matching between digital printing and flexographic printing according to the present invention, wherein: the S51 test evaluation sample: when all the standardized printing processes are ready, printing a proof on the traditional printing equipment and the digital printing equipment respectively; color control bars on such sheets at the nip and drag tips can check the seal Zhang Shifou for seal flatness; the middle large color block is IT8.7/3, and can be used for data acquisition of ICC.
The S52 color conversion: measuring color blocks from the output sample sheet and comparing the color blocks with a target value, and determining whether the color blocks pass or not according to the result; selecting data matched with the measured value in third-party color management software for verification to obtain a delta E color difference value; when all data are obtained, the result comparison can be started; judging the quality of the printed matter in a subjective and objective combination mode; if neither of these tests is problematic, it can be determined that the two printing modes have been color matched.
Compared with the prior art:
1. the color matching of the digital printing and the traditional printing is realized, the advantage of delta E of the digital printing is combined with the traditional printing, the printing quality is better, and the printing and flow efficiency is effectively improved; the printing and proofing colors can be matched quickly;
2. the printing machine has the advantages that the printing machine is not only dependent on personal experience of a printer, the automation degree is remarkably improved, the printing efficiency is improved, the loss of paper and ink is greatly reduced, the printing speed is greatly improved, and the product competitiveness is improved;
3. the method can ensure that the closeness degree of the color of the pattern printed by the new product for the first time through the preprinting machine and the standard sample sheet of the customer reaches more than 97 percent; the control in the aspects of hue, lightness and saturation is matched with the flexography, and the digital printing equipment and the flexography equipment are consistent in the aspects of output quality, color and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.
The invention provides a method for matching colors of digital printing and flexography, which comprises the following steps;
s1, performing daily maintenance and maintenance of a machine, particularly cleaning and maintaining parts which have large influence on printing quality;
s2, automatically calibrating the color of the machine by using an online densitometer carried by the machine;
s3, preparing early-stage preparation work; because the uncontrollable factors of the printing equipment are more, such as the new and old degree of the rolling simplification of the rubber blanket, the control of the ink-water balance of the machine, the enlargement of the dots and the performances of the printing stock and the printing ink all can influence the printing quality, the printing equipment is adjusted to the standard state; the method specifically comprises the steps of S31 adjusting traditional printing equipment and printing conditions, S32 controlling printing solid density, S33 adjusting the ratio of a dot expansion curve, S34 controlling gray balance, S35 adjusting printing uniformity and S36 controlling printing speed;
s4, preparing digital printing; the method specifically comprises the steps of S41 printer linearization calibration, S42 recording a characterization curve, S43 color conversion and S44 color matching;
s5, detecting a printed product; the method specifically comprises S51 test evaluation sample, S52 data measurement and result comparison.
S31, adjusting the traditional printing equipment and the printing conditions: the traditional printing equipment and the common spare and accessory parts and consumables thereof need to be maintained and reasonably maintained, for example, rubber cloth is replaced, a proper packing is selected, the pressure between printing plates and the pH value of fountain solution are adjusted, and the environment temperature and humidity are well controlled; printing is started ready, using the color sequence black/cyan/magenta/yellow.
The S32 print solid density control: in the whole printing process, printing is carried out according to the printing standard, the seal Zhang Yinping is printed (the color difference delta E of solid color blocks of the primary colors of the plate is kept within 3), and the density value of each solid primary color when the color difference is minimum is recorded, so that the color control in the actual printing production is facilitated: and adjusting the proportion of the S33 dot gain curve: in the working flow before printing, the influence of the dot expansion on the printing is controlled by adjusting the expansion ratio of the dots and manufacturing an inverse compensation curve corresponding to the printing plate; in the plate making process, the traditional printing IS controlled according to the dot expansion curve provided in IS0 12647-2, and the intermediate dot expansion ratio IS about 16%.
S34, controlling ash balance: controlling the neutral ash part of the printed matter well to obtain a qualified printed matter; in the actual printing production, relevant color management software is adopted to make an equipment characteristic curve of the printing press, the equipment characteristic curve is put into a CTP flow to control the corresponding printing plate output, or a G7 calibration curve method is adopted to make a printing plate compensation curve to realize the neutral gray balance of a printed matter.
S35, adjusting printing uniformity: the deviation of the gray balance is minimized by adjusting the press buttons to minimize the deviation of the solid density on the printed sheet, so that the deviation of each ink on the printing surface does not exceed a value of 0.05, preferably not more than 1.0a or 2.0b on the printed area or roll.
The S36 printing speed control: running the machine (preheat machine) at a production speed of 1000 sheets or more, again checking the solid density, ash balance and uniformity; if the change of the solid density, the ash balance or the uniformity of the ink exceeds a numerical value, adjusting the printing machine to ensure that the qualified printing requirement is obtained, then accelerating again according to the requirement, and printing at the normal production speed to ensure the uniformity and the relative stability of the quality of the printed matter; after the above steps are completed, the printing device has reached a relatively good state, at which time the production of a traditional printed device profile (ICC profile), printing IT8.7/3 or ECI2002, the production of a printing device output profile and the comparison with the IS0 standard proof are started.
The S41 printer linearization calibration: calibration means performing a defined process under defined conditions, using a reference standard value, to enable the digital printer to generate predictable colors from a specific color input value, and then evaluating the color values; generally, in order to judge the printing condition or uncertain factors of the equipment, the equipment is regularly calibrated, which is more beneficial to improving the accuracy of the color output of the equipment;
the S42 record characterization curve: different input or output devices have different color representation capabilities; the same set of RGB or CMYK color values are output on different devices, and different color effects can be presented; the purpose of the characterization is to establish the color characteristics of each device, and the color characteristics can be recorded by generating a 'feature file' through the cooperation of third-party color management software and hardware; this step is used to make an ICC profile for a digital printing device.
The S43 color conversion: firstly, converting a color mode from RGB into a Lab mode, and then converting the color mode into a CMYK mode; printing is the process of color reproduction and reproduction; each device has its own color gamut space, and color conversion of the color gamut space is required in the copying process; of course, the color conversion is also by no means one hundred percent "reproduced" but gives the best color for the device, while letting the operator know the result, i.e. "what you see is what you get"; the ICC output curve of the printing machine manufactured in the previous printing process is used as a target to carry out analog matching on the ICC output curve, and the obtained digital printing machine curve is used as a final output curve; s44, color matching: color matching is accomplished by third party color management software, which chooses GMG or CGS.
The S51 test evaluates the proof: when all the standardized printing processes are ready, printing samples on the traditional printing equipment and the digital printing equipment respectively; color control bars on such sheets at the nip and drag tips can check the seal Zhang Shifou for seal flatness; the middle large color block is IT8.7/3, and can be used for data acquisition of ICC.
The S52 color conversion: the process of color verification is generally simple and in some cases can be fully automated; measuring color blocks from the output sample sheet and comparing the color blocks with a target value, and determining whether the color blocks pass or not according to the result; selecting data matched with the measured value in third-party color management software for verification to obtain a delta E color difference value; when all data are obtained, the result comparison can be started; judging the quality of the printed matter in a subjective and objective combination mode; the subjective finger eye performs visual inspection to judge whether the traditional seal Zhang Heshu character seal Zhang Seyang is close to or not; objectively means whether the data acquired by the two printing modes meet the international standard (data acquisition delta E < 3); if neither of these tests is problematic, it can be determined that the two printing modes have been color matched.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A method for matching colors of digital printing and flexography is characterized by comprising the following steps;
s1, performing daily maintenance and maintenance of a machine, particularly cleaning and maintaining parts which have large influence on printing quality;
s2, automatically calibrating the color of the machine by using an online densitometer carried by the machine;
s3, preparing early-stage preparation work; because the uncontrollable factors of the printing equipment are more, the printing equipment is adjusted to a standard state; the method specifically comprises the steps of S31 adjusting traditional printing equipment and printing conditions, S32 controlling printing solid density, S33 adjusting the ratio of a dot expansion curve, S34 controlling gray balance, S35 adjusting printing uniformity and S36 controlling printing speed;
s4, preparing digital printing; the method specifically comprises the steps of S41 printer linearization calibration, S42 recording a characterization curve, S43 color conversion and S44 color matching;
s5, detecting a printed product; the method specifically comprises S51 test evaluation sample, S52 data measurement and result comparison.
2. The method for matching colors of digital printing and flexographic printing according to claim 1, wherein said S31 adjusts conventional printing equipment and printing conditions: changing rubber cloth, selecting proper packing, adjusting the pressure between printing plates and the pH value of fountain solution, and controlling the temperature and the humidity of the environment; printing is started ready, using the color sequence black/cyan/magenta/yellow.
3. The method of digital printing and flexographic color matching according to claim 1, wherein said S32 printing solid density control: in the whole printing process, printing is carried out according to the printing standard, the seal Zhang Yinping is printed, and the density values of solid primary colors are recorded when the color difference is minimum, so that the color control in the actual printing production is facilitated: and adjusting the proportion of the S33 dot gain curve: in the working flow before printing, the influence of the dot expansion on the printing is controlled by adjusting the expansion ratio of the dots and manufacturing an inverse compensation curve corresponding to the printing plate; in the plate making process, the traditional printing IS controlled according to the dot expansion curve provided in IS0 12647-2, and the intermediate dot expansion ratio IS about 16%.
4. The method of claim 1, wherein the S34 gray balance control: controlling the neutral ash part of the printed matter well to obtain a qualified printed matter; in the actual printing production, relevant color management software is adopted to make an equipment characteristic curve of the printing machine, the characteristic curve is put into a CTP flow to control the corresponding printing plate output, or a G7 calibration curve method is adopted to make a printing plate compensation curve to realize the neutral gray balance of a printed matter.
5. The method for color matching between digital printing and flexographic printing according to claim 1, wherein said S35 adjusts printing uniformity: the press key is adjusted to reduce the variation of solid density on the printed sheet, the variation of each ink on the printing surface is not more than 0.05, so that the variation of gray balance is as small as possible, and the variation of gray balance is not more than 1.0a or 2.0b on the printing area or the rolling position.
6. The method of claim 1, wherein the S36 print speed control: running the machine with a production speed of 1000 sheets or more, again checking the solid density, ash balance and uniformity; if the variation of the solid density, the ash balance or the uniformity of the printing ink exceeds a numerical value, adjusting the printing machine to ensure that the qualified printing requirement is obtained, then accelerating again according to the requirement, and printing at the normal production speed to ensure the uniformity and the relative stability of the quality of the printed matter; after the above steps are completed, the printing press has reached a relatively good state, at which point the production of the press profile for conventional printing, printing IT8.7/3 or ECI2002, the production of the press output profile and comparison with the IS0 proof are commenced.
7. The method of claim 1, wherein the S41 printer linearization calibration is: the digital printer is capable of generating foreseeable colors from a specific color input value and evaluating the color value;
said S42 records a characterization curve: establishing color characteristics of each device, wherein the color characteristics can be recorded by generating a 'feature file' through the cooperation of third-party color management software and hardware; this step is used to create a profile for the digital printing apparatus.
8. The method of claim 1, wherein the S43 color conversion: firstly, converting a color mode from RGB into a Lab mode, and then converting the color mode into a CMYK mode; printing is the process of color reproduction and reproduction; each device has its own color gamut space, and performs color conversion of the color gamut space in the copying process; utilizing the ICC output curve of the printing machine made in the previous printing process as a target to carry out analog matching on the ICC output curve, and taking the obtained digital printing machine curve as a final output curve; s44, color matching: color matching is accomplished by third party color management software, which chooses GMG or CGS.
9. The method of claim 1, wherein the S51 test evaluates a proof: when all the standardized printing processes are ready, printing samples on the traditional printing equipment and the digital printing equipment respectively; color control bars on such sheets at the nip and drag tips can check the seal Zhang Shifou for seal flatness; the middle large color block is IT8.7/3, and can be used for data acquisition of ICC.
10. The method of digital printing and flexographic color matching according to claim 1, wherein said S52 color conversion: measuring color blocks from the output sample sheet and comparing the color blocks with a target value, and determining whether the color blocks pass or not according to the result; selecting data matched with the measured value in third-party color management software for verification to obtain a delta E color difference value; when all data are obtained, the result comparison can be started; judging the quality of the printed matter in a subjective and objective combination mode; if neither of these tests is problematic, it can be determined that the two printing modes have been color matched.
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| CN202211350442.XA CN115593125A (en) | 2022-10-31 | 2022-10-31 | Method for matching colors of digital printing and flexography |
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